[openacc] Teach gfortran to lower OpenACC routine dims

[Bernhard Reutner-Fischer]

On 24 September 2018 16:45:38 CEST, Cesar Philippidis <cesar@codesourcery.com> wrote:

>I updated the patch by incorporating all of those changes. Is it OK for
>trunk?

LGTM but I cannot approve it.

thanks,